Personally, I like Mi Amigo's, but the general consensus seems to be that it's just OK.
The reason I give it 4 stars is because every time I come here I have a good experience. The food is always good, the drinks are good (especially happy hour drinks), the staff is friendly, it's never too busy or crowded.
I really like their enchiladas, but some of their food is a little "Americanized". For example, their chicken quesadillas are literally just chicken and cheese. Most authentic Mexican places I go to put in pepper jack or onions into their quesadillas. But like I said, that doesn't really bother me because the food is still awesome.
Also, if you park in the AZ Center parking garage, they WILL validate your parking :)
It's nothing fancy or special, but for a generic Mexican restaurant their food and drinks are really good. Friendly staff too. Would recommend it to anyone!